com Plug the small end of the power cord into the. units power jack. Plug the large end into the vehicles cigarette Plug the large end into the vehicles cigarette Whistler XTR145 Manuals& User Guides. User Manuals, Guides and Specifications for your Whistler XTR145 Radar Detector. Database contains 1 Whistler XTR145 Manuals (available for free online viewing or downloading in PDF): Owner's manual.